From: Christian Lamparter <chunkeey@googlemail.com>
To: "Richard Schütz" <r.schtz@t-online.de>
Cc: linux-wireless@vger.kernel.org
Subject: Re: ath9k prevents CPU from entering C4 state (kernel 2.6.37 regression)
Date: Sat, 22 Jan 2011 23:52:42 +0100 [thread overview]
Message-ID: <201101222352.42913.chunkeey@googlemail.com> (raw)
In-Reply-To: <4D3B4057.5000206@t-online.de>
On Saturday 22 January 2011 21:38:47 Richard Schütz wrote:
> I noticed that from kernel 2.6.37 on (i've tested 2.6.38-rc2, too) ath9k
> prevents my CPU (Intel Atom N450) from entering the C4 power state. It
> only goes down to C2 (there's no C3) instead. In 2.6.36(.3) everything
> is still fine. The CPU will only go down to C4 with 2.6.37 when the
> wireless interface is brought down.
"ath9k: Fix a DMA latency issue for Intel Pinetrail platforms."
http://www.spinics.net/lists/linux-wireless/msg58264.html
the pm_qos value will be configurable with 2.6.38:
"ath9k: Make PM-QOS value as user configurable"
http://www.spinics.net/lists/linux-wireless/msg61259.html
"This will help our customers to configure the pm-qos value according
to the effect in throughput due to the DMA latency problem which was
observed in Intel Pinetrail platforms."
next prev parent reply other threads:[~2011-01-22 22:52 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-01-22 20:38 ath9k prevents CPU from entering C4 state (kernel 2.6.37 regression) Richard Schütz
2011-01-22 22:52 ` Christian Lamparter [this message]
2011-01-22 23:49 ` Thomas Bächler
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